Grusha's Cetoddle was the first Pokémon that
Grusha caught. While snowboarding,
Grusha's Cetoddle got very close to each other and caused
Grusha to crash an severely hurt his foot. Concerned about his health, Cetoddle waited outside the hospital for him to leave and that's when it let itself be caught. It is a separate Pokémon to
Grusha's Cetitan and not its unevolved form.